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%I #5 Mar 11 2014 01:34:11
%S 326,748,166,748,166,166,748,748,166,166,748,748,166,748,748,748,166,
%T 166,166,748,166,166,166,166,166,166,166,748,748,166,748,748,166,748,
%U 166,166,166,166,166
%N Concatenation of final digit of n-th Mersenne prime A000668(n), final digit of n-th even superperfect number A061652(n) and final digit of n-th perfect number A000396(n).
%C Also, concatenation of final digit of n-th Mersenne prime A000668(n), final digit of n-th superperfect number A019279(n) and final digit of n-th perfect number A000396(n), if there are no odd superperfect numbers.
%C Also, concatenation of n-th term of A080172, A138125(n) and A094540(n).
%C a(1)=326. For n>1 a(n) is equal to 166 or 748, only.
%H L. C. Noll, <a href="http://www.isthe.com/chongo/tech/math/prime/mersenne.html">Mersenne Prime Digits and Names</a>.
%H Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a>.
%Y Cf. A000396, A000668, A019279, A061652, A080172, A094540, A138125, A138817.
%K base,nonn,less
%O 1,1
%A _Omar E. Pol_, Apr 01 2008
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